Patents by Inventor Jon D. Dubois

Jon D. Dubois has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20140021244
    Abstract: A method of manufacturing coiled tubing comprises joining two portions of parent stock metal by friction stir welding. The adjoining portions of said two portions of parent stock metal are first reduced to a deformable plastic state, and then allowed to cool in such a manner that there is no re-crystallization of parent stock metal in a resulting weld.
    Type: Application
    Filed: June 10, 2013
    Publication date: January 23, 2014
    Inventor: Jon D. DuBois
  • Patent number: 5191911
    Abstract: A system for making a long length of seam-welded tubing from shorter lengths of flat metal strip which are spliced end-to-end and formed into tubular form and seam-welded. Adjoining ends of two successive lengths of the strip are trimmed at supplementary angles, one of which is an acute angle. The trimmed ends are abutted and welded, preferably with weldment extending beyond each such end. All surfaces of the weld are finished to match the dimensions of the strip. The tubing, along with the welded joints, is heat treated as the tubing is formed to produce a product substantially free of internal surface roughness along the splice welds.
    Type: Grant
    Filed: January 28, 1992
    Date of Patent: March 9, 1993
    Assignee: Quality Tubing, Inc.
    Inventor: Jon D. Dubois
  • Patent number: 4863091
    Abstract: A system for making a long length of seam-welded tubing from shorter lengths of flat metal strip which are spliced end-to-end and formed into tubular form and seam-welded. Adjoining ends of two successive lengths of the strip are trimmed at supplementary angles, one of which is an acute angle. The trimmed ends are abutted and welded, preferably with weldment extending beyond each such end. All surfaces of the weld are finished to match the dimensions of the strip. The tubing, along with the welded joints, is heat treated as the tubing is formed to produce a product substantially free of internal surface roughness along the splice welds.
    Type: Grant
    Filed: March 18, 1987
    Date of Patent: September 5, 1989
    Assignee: Quality Tubing, Inc.
    Inventor: Jon D. Dubois
  • Patent number: 4629218
    Abstract: A coil tubing string for injecting fluids into a well includes one or more tapered wall tubing sections welded in series with adjacent straight wall tubing sections to form smooth joints therebetween. The tubing string has tubing sections of dissimilar wall thicknesses. Such tapered wall tubing sections are used to connect tubing sections of dissimilar wall thicknesses wherein the transitions from one tubing section to another is smooth and continuous as one progresses from a thin wall tubing section to a heavy wall tubing section in an ascending order.
    Type: Grant
    Filed: January 29, 1985
    Date of Patent: December 16, 1986
    Assignee: Quality Tubing, Incorporated
    Inventor: Jon D. Dubois